boolean negativePreconditions = false;
Iterator<RequireKey> requirements = this.pddlObject.requirementsIterator();
while(requirements.hasNext()){
RequireKey requireKey = requirements.next();
if(requireKey == RequireKey.NEGATIVE_PRECONDITIONS){
negativePreconditions = true;
logger.severe("--> The Problem has Negative Preconditions\n");
}
}